Android - 保存大型Xml文件（內部/ SD卡）

Question

我想保存一個非常大的在線xml文件（大約33mb）。我想在StringBuilder中獲取xml文件，將其轉換爲字符串，然後通過FileOutputStream將文件保存在內部存儲/ Sdcard中。

但我越來越內存和應用程序崩潰。當我嘗試從StringBuilder獲取字符串中的值時發生崩潰。

這裏是我當前的代碼：

 DefaultHttpClient httpClient = new DefaultHttpClient(); 
     HttpPost httpPost = new HttpPost("sorry cant paste the actual link due copyrights.xml"); 

     HttpResponse httpResponse = httpClient.execute(httpPost); 
     HttpEntity httpEntity = httpResponse.getEntity(); 
     is = httpEntity.getContent();    

    } catch (UnsupportedEncodingException e) { 
     e.printStackTrace(); 
    } catch (ClientProtocolException e) { 
     e.printStackTrace(); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 

    try { 
     BufferedReader reader = new BufferedReader(new InputStreamReader(
       is, "iso-8859-1"), 8); 
     StringBuilder sb = new StringBuilder(); 
     String line = null; 
     while ((line = reader.readLine()) != null) { 

      sb.append(line + "\n"); 
     } 
     is.close(); 

     String result = sb.toString(); 

     System.out.println(result); 

     FileOutputStream fos = openFileOutput("test.xml", Context.MODE_PRIVATE); 

     fos.write(sb.toString().getBytes()); 

     fos.close(); 

    } catch (Exception e) { 
     Log.e("Buffer Error", "Error converting result " + e.toString()); 
    } 

Answer 1

與soulution的問題是，它需要大量的應用程序內存的，因爲XML字符串完全loded到內存中。

您可以通過處理豆蔻1KB塊數據這樣可以避免這一點：

is = httpEntity.getContent(); 

    FileOutputStream fos = openFileOutput("test.xml", Context.MODE_PRIVATE); 

    byte[] buffer = new byte[1024]; 
    int length; 
    while ((length = is.read(buffer))>0){ 
     fos.write(buffer, 0, length); 
    } 

    fos.flush(); 
    fos.close(); 
    is.close(); 

Answer 2

你可以試試下面的代碼？

BufferedReader reader = new BufferedReader(new InputStreamReader(
     is, "iso-8859-1"), 8); 
FileOutputStream fos = openFileOutput("test.xml", Context.MODE_PRIVATE); 
StringBuilder sb = new StringBuilder(); 
String line = null; 
while ((line = reader.readLine()) != null) { 

    sb.append(line + "\n"); 

    if (sb.toString().length() > 10000) { 
     fos.write(sb.toString().getBytes()); 
     fos.flush(); 
     sb = new StringBuilder(); 
    } 
} 
is.close(); 

fos.close();